Message-ID: <26170609.1054740497@lemmens.socsci.kun.nl>
Date: 2003-06-04T13:28:17Z
From: Paul Lemmens
Subject: simple matrix question
In-Reply-To: <1054732912.2712.1.camel@christophl>
Hoi Christoph,
--On woensdag 4 juni 2003 15:21 +0200 Christoph Lehmann
<lehmann at puk.unibe.ch> wrote:
> what is the easiest way to get from
> x
> x1 x2
> [1,] 2 3
> [2,] 3 2
> [3,] 1 3
> [4,] 1 4
>
> xbar1
> x1 x2
> [1,] 1.75 3
> [2,] 1.75 3
> [3,] 1.75 3
> [4,] 1.75 3
>
> with the mean of the columns of x as values?
>
xbar1 <- tapply(as.vector(x), gl(2,4), mean);
--
Paul Lemmens
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